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Related to X's integration with Toolset, I read the changelog, indeed there is some nice movement there, I see.
I forwarded this to my Team leader just in case we are not aware of this at the developer level, maybe we can work together or help each other, great that you shared this with me.
Now, performance wise, I'd love to say no, however that wouldn't be entirely true. Every software adds a bit to the load, Toolset can add a lot if you have for example very complex, and nested into each other Views (which then, in fact, are many nested Queries).
Here, due to the fact that we are using the WP Query which hits only one Database Post Table, things can become slow as said on large views, or nested views.
In this case, the slowdown can be remarkably and you would have to break down the queries results with some pagination to solve this.
Another thing to consider is, Toolset brings a whole lot of features but they are made with Code 🙂
And code sometimes relies on other code, etc, in other words, Toolset may appear to enqueue a whole lot of Scripts and Styles in the front end (for tools like GTMetrix this is a red flag often), and it may seem unnecessary.
However we try to assure we load our scripts only where and when needed if possible, sometimes due to the features it's just not possible (such as a view's AJAX features, for example, need code to be present on a page before we even know what View you load, hence we load it everywhere.
This is not something that you will notice but tools like GTMetrix might complain.
Note, here we are not speaking of slowdowns that you should notice as visitors of a page. This are merely technical measurement differences and issues you may stumble on when working with Toolset.
You can, of course, display all your content (even if created with Toolset) using Code, but that will not really save a lot in performance if any.
Hope it's clear, please let me know if not!